As a Divine Being you have a group of followers from whom you derive your power.
The more followers you have and the greater their achievements, the more power you wield. Unfortunately, there is another group of people who follow a different deity.
Since there's barely enough room in the world for your own magnificence, two won't do.
You must rid the world of the opposition. To do this, you will use your great power to move the earth and your devout followers to crush the misguided.